Portrait of Joshua Tagoe

Frontend software engineer

Joshua Tagoe

I build interfaces where a model can propose and the product can check.

I spent 2026 on LangSmith at LangChain, working on trace filtering and the views people use to inspect LLM and agent runs. Before that I built shopping experiences at Google.

ResumeContact

  1. LangSmith

    A filter is a view you can return to.

  2. Clinical Co-Pilot

    A missing record is not “not done.”

  3. Red team

    A fix counts when the same attack fails the check.

01 — About

From NYU to LangSmith.

Joshua is a frontend software engineer. He studied computer science at NYU, built Living Insight during the Insight fellowship, and shipped product at Novative and Google. From January to July 2026 he was a frontend engineer at LangChain, on LangSmith.

Languages
TypeScript · JavaScript · Python · Java · C#
Frontend
React · Next.js
Backend
Node.js · Express · .NET
Databases
PostgreSQL · MongoDB
Cloud and tools
AWS · GCP · Docker · Git · Spark

02 — Selected work

Hold each frame.

All projects
Plan check with metformin and HbA1c marked as no matching record

01 / 06

Clinical Co-Pilot

A commitment gets a state

The model proposes a commitment, and code assigns a state. A missing record is not “not done.”

Co-pilot agent
Results list with citations and a flagged high hemoglobin value

02 / 06

Clinical Co-Pilot

A citation, or unverified

The panel shows a citation, or the value is unverified. Hemoglobin is flagged high and still tied to the record that produced it.

OpenEMR
Document values marked found on the page or un-filed because they entered in error

03 / 06

Clinical Co-Pilot

Filed, rejected, or un-filed

A value read from a document is filed, rejected, or left un-filed. Nothing new is briefed once every value has a state.

Patient dashboard

Four access-control bugs, then a replay that failed.

04 / 06

Clinical Co-Pilot

A report, not a scan

The red-team page shows a completed report. A fix counts when the same attack fails the check. It cannot start a scan.

Report viewer
Food Truck Finder map and search

05 / 06

Food Truck Finder

Search, then a map

Geospatial filtering, autocomplete, and a map preview sit on one search API.

Repository
Living Insight regional dashboard

06 / 06

Living Insight

Open data, one region

NYC open data and simulated real-estate records, read through regional dashboards.

Repository

03 — Clinical Co-Pilot

How an answer is checked

The model can propose. It cannot decide that a record is missing, cited, or in conflict.

Clinical Co-Pilot check01 MODELProposes acommitment02 CODEAssigns a stateThe model cannot decide03 PANELCitation, orunverifiedEVIDENCE FOUNDA citation stayson the recordHemoglobin flagged highstill names its source.NO MATCHING RECORDMissing is not“not done.”Metformin and HbA1ccan leave the chart open.RECORDS CONFLICTTwo recordsdisagreeThe panel does notpick a winner.

Work

Where I can help

  • Observability interfaces

    Filtering, trace inspection, and dense data views for LLM and agent workflows. LangSmith is the example. Clinical Co-Pilot uses the same kind of trace view.

  • Product frontend

    Large-scale React and TypeScript UI, including experimentation and localization. Google shopping is the example.

  • Full-stack web apps

    React, Next.js, Node, and Express, with maps, search, and tests. Food Truck Finder is the example.

The form on this page reaches joshua@tagoe.dev.

Services

Contact

Write to me

Hiring, a product question, or a project. I read joshua@tagoe.dev.